1 /****************************************************************************
3 * Video BOOT Graphics Card POST Module
5 * ========================================================================
6 * Copyright (C) 2007 Freescale Semiconductor, Inc.
7 * Jason Jin <Jason.jin@freescale.com>
9 * Copyright (C) 1991-2004 SciTech Software, Inc. All rights reserved.
11 * This file may be distributed and/or modified under the terms of the
12 * GNU General Public License version 2.0 as published by the Free
13 * Software Foundation and appearing in the file LICENSE.GPL included
14 * in the packaging of this file.
16 * Licensees holding a valid Commercial License for this product from
17 * SciTech Software, Inc. may use this file in accordance with the
18 * Commercial License Agreement provided with the Software.
20 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
21 * THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * See http://www.scitechsoft.com/license/ for information about
25 * the licensing options available and how to purchase a Commercial
28 * Contact license@scitechsoft.com if any conditions of this licensing
29 * are not clear to you, or you have questions about licensing options.
31 * ========================================================================
34 * Environment: Linux Kernel
35 * Developer: Kendall Bennett
37 * Description: Module to implement booting PCI/AGP controllers on the
38 * bus. We use the x86 real mode emulator to run the BIOS on
39 * graphics controllers to bring the cards up.
41 * Note that at present this module does *not* support
42 * multiple controllers.
44 * The orignal name of this file is warmboot.c.
45 * Jason ported this file to u-boot to run the ATI video card
47 ****************************************************************************/
52 /* Length of the BIOS image */
53 #define MAX_BIOSLEN (128 * 1024L)
55 /* Define some useful types and macros */
59 /* Place to save PCI BAR's that we change and later restore */
60 static u32 saveROMBaseAddress;
61 static u32 saveBaseAddress10;
62 static u32 saveBaseAddress14;
63 static u32 saveBaseAddress18;
64 static u32 saveBaseAddress20;
66 /****************************************************************************
68 pcidev - PCI device info for the video card on the bus to boot
69 VGAInfo - BIOS emulator VGA info structure
72 This function executes the BIOS POST code on the controller. We assume that
73 at this stage the controller has its I/O and memory space enabled and
74 that all other controllers are in a disabled state.
75 ****************************************************************************/
76 static void PCI_doBIOSPOST(pci_dev_t pcidev, BE_VGAInfo * VGAInfo)
81 /* Determine the value to store in AX for BIOS POST. Per the PCI specs,
82 AH must contain the bus and AL must contain the devfn, encoded as
85 memset(®s, 0, sizeof(regs));
86 memset(&sregs, 0, sizeof(sregs));
87 regs.x.ax = ((int)PCI_BUS(pcidev) << 8) |
88 ((int)PCI_DEV(pcidev) << 3) | (int)PCI_FUNC(pcidev);
90 /*Setup the X86 emulator for the VGA BIOS*/
93 /*Execute the BIOS POST code*/
94 BE_callRealMode(0xC000, 0x0003, ®s, &sregs);
100 /****************************************************************************
102 pcidev - PCI device info for the video card on the bus
103 bar - Place to return the base address register offset to use
106 The address to use to map the secondary BIOS (AGP devices)
109 Searches all the PCI base address registers for the device looking for a
110 memory mapping that is large enough to hold our ROM BIOS. We usually end up
111 finding the framebuffer mapping (usually BAR 0x10), and we use this mapping
112 to map the BIOS for the device into. We use a mapping that is already
113 assigned to the device to ensure the memory range will be passed through
114 by any PCI->PCI or AGP->PCI bridge that may be present.
116 NOTE: Usually this function is only used for AGP devices, but it may be
117 used for PCI devices that have already been POST'ed and the BIOS
118 ROM base address has been zero'ed out.
120 NOTE: This function leaves the original memory aperture disabled by leaving
121 it programmed to all 1's. It must be restored to the correct value
123 ****************************************************************************/
124 static u32 PCI_findBIOSAddr(pci_dev_t pcidev, int *bar)
128 for (*bar = 0x10; *bar <= 0x14; (*bar) += 4) {
129 pci_read_config_dword(pcidev, *bar, &base);
131 pci_write_config_dword(pcidev, *bar, 0xFFFFFFFF);
132 pci_read_config_dword(pcidev, *bar, &size);
133 size = ~(size & ~0xFF) + 1;
134 if (size >= MAX_BIOSLEN)
141 /****************************************************************************
143 Some non-x86 Linux kernels map PCI relocateable I/O to values that
144 are above 64K, which will not work with the BIOS image that requires
145 the offset for the I/O ports to be a maximum of 16-bits. Ideally
146 someone should fix the kernel to map the I/O ports for VGA compatible
147 devices to a different location (or just all I/O ports since it is
148 unlikely you can have enough devices in the machine to use up all
149 64K of the I/O space - a total of more than 256 cards would be
152 Anyway to fix this we change all I/O mapped base registers and
153 chop off the top bits.
154 ****************************************************************************/
155 static void PCI_fixupIObase(pci_dev_t pcidev, int reg, u32 * base)
157 if ((*base & 0x1) && (*base > 0xFFFE)) {
159 pci_write_config_dword(pcidev, reg, *base);
164 /****************************************************************************
166 pcidev - PCI device info for the video card on the bus
169 Pointers to the mapped BIOS image
172 Maps a pointer to the BIOS image on the graphics card on the PCI bus.
173 ****************************************************************************/
174 void *PCI_mapBIOSImage(pci_dev_t pcidev)
180 /*Save PCI BAR registers that might get changed*/
181 pci_read_config_dword(pcidev, PCI_ROM_ADDRESS, &saveROMBaseAddress);
182 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_0, &saveBaseAddress10);
183 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_1, &saveBaseAddress14);
184 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_2, &saveBaseAddress18);
185 pci_read_config_dword(pcidev, PCI_BASE_ADDRESS_4, &saveBaseAddress20);
187 /*Fix up I/O base registers to less than 64K */
188 if(saveBaseAddress14 != 0)
189 PCI_fixupIObase(pcidev, PCI_BASE_ADDRESS_1, &saveBaseAddress14);
191 PCI_fixupIObase(pcidev, PCI_BASE_ADDRESS_4, &saveBaseAddress20);
193 /* Some cards have problems that stop us from being able to read the
194 BIOS image from the ROM BAR. To fix this we have to do some chipset
195 specific programming for different cards to solve this problem.
198 BIOSImageBus = PCI_findBIOSAddr(pcidev, &BIOSImageBAR);
199 if (BIOSImageBus == 0) {
200 printf("Find bios addr error\n");
204 BIOSImage = pci_bus_to_virt(pcidev, BIOSImageBus,
205 PCI_REGION_MEM, 0, MAP_NOCACHE);
207 /*Change the PCI BAR registers to map it onto the bus.*/
208 pci_write_config_dword(pcidev, BIOSImageBAR, 0);
209 pci_write_config_dword(pcidev, PCI_ROM_ADDRESS, BIOSImageBus | 0x1);
213 /*Check that the BIOS image is valid. If not fail, or return the
214 compiled in BIOS image if that option was enabled
216 if (BIOSImage[0] != 0x55 || BIOSImage[1] != 0xAA || BIOSImage[2] == 0) {
223 /****************************************************************************
225 pcidev - PCI device info for the video card on the bus
228 Unmaps the BIOS image for the device and restores framebuffer mappings
229 ****************************************************************************/
230 void PCI_unmapBIOSImage(pci_dev_t pcidev, void *BIOSImage)
232 pci_write_config_dword(pcidev, PCI_ROM_ADDRESS, saveROMBaseAddress);
233 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_0, saveBaseAddress10);
234 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_1, saveBaseAddress14);
235 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_2, saveBaseAddress18);
236 pci_write_config_dword(pcidev, PCI_BASE_ADDRESS_4, saveBaseAddress20);
239 /****************************************************************************
241 pcidev - PCI device info for the video card on the bus to boot
242 VGAInfo - BIOS emulator VGA info structure
245 True if successfully initialised, false if not.
248 Loads and POST's the display controllers BIOS, directly from the BIOS
249 image we can extract over the PCI bus.
250 ****************************************************************************/
251 static int PCI_postController(pci_dev_t pcidev, BE_VGAInfo * VGAInfo)
257 /*Allocate memory to store copy of BIOS from display controller*/
258 if ((mappedBIOS = PCI_mapBIOSImage(pcidev)) == NULL) {
259 printf("videoboot: Video ROM failed to map!\n");
263 BIOSImageLen = mappedBIOS[2] * 512;
265 if ((copyOfBIOS = malloc(BIOSImageLen)) == NULL) {
266 printf("videoboot: Out of memory!\n");
269 memcpy(copyOfBIOS, mappedBIOS, BIOSImageLen);
271 PCI_unmapBIOSImage(pcidev, mappedBIOS);
273 /*Save information in VGAInfo structure*/
274 VGAInfo->function = PCI_FUNC(pcidev);
275 VGAInfo->device = PCI_DEV(pcidev);
276 VGAInfo->bus = PCI_BUS(pcidev);
277 VGAInfo->pcidev = pcidev;
278 VGAInfo->BIOSImage = copyOfBIOS;
279 VGAInfo->BIOSImageLen = BIOSImageLen;
281 /*Now execute the BIOS POST for the device*/
282 if (copyOfBIOS[0] != 0x55 || copyOfBIOS[1] != 0xAA) {
283 printf("videoboot: Video ROM image is invalid!\n");
287 PCI_doBIOSPOST(pcidev, VGAInfo);
289 /*Reset the size of the BIOS image to the final size*/
290 VGAInfo->BIOSImageLen = copyOfBIOS[2] * 512;
294 /****************************************************************************
296 pcidev - PCI device info for the video card on the bus to boot
297 pVGAInfo - Place to return VGA info structure is requested
298 cleanUp - True to clean up on exit, false to leave emulator active
301 Boots the PCI/AGP video card on the bus using the Video ROM BIOS image
302 and the X86 BIOS emulator module.
303 ****************************************************************************/
304 int BootVideoCardBIOS(pci_dev_t pcidev, BE_VGAInfo ** pVGAInfo, int cleanUp)
308 printf("videoboot: Booting PCI video card bus %d, function %d, device %d\n",
309 PCI_BUS(pcidev), PCI_FUNC(pcidev), PCI_DEV(pcidev));
311 /*Initialise the x86 BIOS emulator*/
312 if ((VGAInfo = malloc(sizeof(*VGAInfo))) == NULL) {
313 printf("videoboot: Out of memory!\n");
316 memset(VGAInfo, 0, sizeof(*VGAInfo));
317 BE_init(0, 65536, VGAInfo, 0);
319 /*Post all the display controller BIOS'es*/
320 if (!PCI_postController(pcidev, VGAInfo))
323 /*Cleanup and exit the emulator if requested. If the BIOS emulator
324 is needed after booting the card, we will not call BE_exit and
325 leave it enabled for further use (ie: VESA driver etc).
329 if (VGAInfo->BIOSImage)
330 free(VGAInfo->BIOSImage);
334 /*Return VGA info pointer if the caller requested it*/